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25 Oct 2007, 17:48

This topic is locked. If you want to discuss this question please re-post it in the respective forum.

A company has 27 machines and 27 pumps. Each machine is hooked up to a pump. At any point of time 13 out of 27 machines are not running and 6 out of 27 pumps are not working. What is the probability that at any given time atleast one bad pump is hooked up to a machine that is not running?